#!/usr/bin/env python

import Options
from optparse import SUPPRESS_HELP

def set_options(opt):
    # allow users to disable gnutls
    opt.add_option('--enable-gnutls',
                   help=("Enable use of gnutls"),
                   action="store_true", dest='enable_gnutls', default=True)
    opt.add_option('--disable-gnutls', help=SUPPRESS_HELP, action="store_false", dest='enable_gnutls')


def configure(conf):
    conf.env.enable_gnutls = Options.options.enable_gnutls
    if not conf.env.enable_gnutls:
        conf.SET_TARGET_TYPE('gnutls', 'DISABLED')
        conf.SET_TARGET_TYPE('gcrypt', 'DISABLED')
        conf.SET_TARGET_TYPE('gpg-error', 'DISABLED')
        if 'AD_DC_BUILD_IS_ENABLED' in conf.env:
            conf.fatal("--disable-gnutls given: Building the AD DC requires GnuTLS (eg libgnutls-dev, gnutls-devel) for ldaps:// support and for the BackupKey protocol")
        return

    if Options.options.with_system_mitkrb5 and conf.env.AD_DC_BUILD_IS_ENABLED:
        conf.CHECK_CFG(package='gnutls',
                       args='"gnutls >= 3.4.7" --cflags --libs',
                       msg='Checking for gnutls >= 3.4.7',
                       mandatory=True)
        conf.DEFINE('HAVE_GNUTLS_3_4_7', 1)
        conf.DEFINE('HAVE_GNUTLS3', 1)
    # Android doesn't have GnuTLS, but it's checking whether the build machine has GnuTLS so the result can be wrong.

    if 'HAVE_GNUTLS' in conf.env:
        conf.DEFINE('ENABLE_GNUTLS', 1)
    else:
        if 'AD_DC_BUILD_IS_ENABLED' in conf.env:
            conf.fatal("Building the AD DC requires GnuTLS (eg libgnutls-dev, gnutls-devel) for ldaps:// support and for the BackupKey protocol")

    conf.CHECK_FUNCS_IN('gnutls_global_init', 'gnutls',
                        headers='gnutls/gnutls.h')

    conf.CHECK_FUNCS_IN('gnutls_certificate_verify_peers3', 'gnutls',
                        headers='gnutls/gnutls.h')
    conf.CHECK_DECLS('GNUTLS_CERT_EXPIRED GNUTLS_CERT_NOT_ACTIVATED GNUTLS_CERT_UNEXPECTED_OWNER',
                     headers='gnutls/gnutls.h gnutls/x509.h')

    conf.CHECK_VARIABLE('gnutls_x509_crt_set_version',
                        headers='gnutls/gnutls.h gnutls/x509.h',
                        define='HAVE_GNUTLS_X509_CRT_SET_VERSION',
                        lib='gnutls')
    conf.CHECK_VARIABLE('gnutls_x509_crt_set_subject_key_id',
                        headers='gnutls/gnutls.h gnutls/x509.h',
                        define='HAVE_GNUTLS_X509_CRT_SET_SUBJECT_KEY_ID',
                        lib='gnutls')

    # check for gnutls_datum types
    conf.CHECK_TYPES('gnutls_datum gnutls_datum_t',
                     headers='gnutls/gnutls.h', lib='gnutls')

    # GnuTLS3 moved to libnettle, so only do this in the < 3.0 case
    if not 'HAVE_GNUTLS3' in conf.env:
        conf.CHECK_FUNCS_IN('gcry_control', 'gcrypt', headers='gcrypt.h')
        conf.CHECK_FUNCS_IN('gpg_err_code_from_errno', 'gpg-error')
    else:
        conf.SET_TARGET_TYPE('gcrypt', 'DISABLED')
        conf.SET_TARGET_TYPE('gpg-error', 'DISABLED')


def build(bld):
    bld.SAMBA_SUBSYSTEM('LIBTLS',
                        source='tls.c tlscert.c tls_tstream.c',
                        public_deps='talloc gnutls gcrypt samba-hostconfig samba_socket LIBTSOCKET tevent tevent-util'
                        )
